Oscillographic cathode-ray tube with cylindrical fluorescent screen



July 4, 1950 A. PlNClROLl OSCILLOGRAPHIC CATHODE-RAY TUBE WITHCYLINDRICAL FLUORESCENT SCREEN Filed Aug. 5, 1948 INVENTUR AIL 94 20;

Paiented Juiy 4, 195% OSCILLOGRAPHIC CATHODE-RAY {EUBE WITH CYLINDRICALFLUORESCENT SCREEN Andrea Pinciroli, Turim' lta'ly Application Aug st 5,1943, Serial No. 42,706

In Italy August 8, 1947 15 Claims. (Cl. 315-24) 1 "The present inventionrelates to an oscillographic cathode ray tube with fluorescent screen.

According to this'invention, the fluorescent screen has the shape of acylindrical surface.

This surface may be extended as to cover completely the cylinder or maybe extended along only a segment of it. The time base is originated by arotating field acting upon an electron beam created as usual by anelectron gun. The electron 'beam is" further bent to a directionapproximately perpendicular to'the surface of the screen by an adequateelectric field.

The time base is produced without saw toothed voltagesj it requiressinusoidal electric quantities, voltages or currents having a lowerfrequency than that'cf the voltage to be examined. The apparatus, objectofthe invention, also allows the simultaneous recording 'otmore than oneo's'cillographic curve, of quantities having the same frequency orhaving frequencies multiple from one another. The obtained time base isparticularly extended. The apparatus allows also for the simultaneousexamination of a large number of electric quantities voltages orcurrents with their oscillographic flgure projected along separatesegments of the cylindrical screen.

It is also possible to arrange in the samevacuum tube two separateelectron beam systems in order to obtain two diflerent time bases.Finally there is no interaction between time base system and electronbeam deflecting system.

The new invention will be better understood,

with the aid of the accompanying figures.

Figure 1 shows the tube completely in partial section; Figure 2 shows amodification of the deflecting SySllElZl; Figure 3 shows a tube with twosimultaneous time bases; Figure 4 shows a tube having its fluorescentscreen extended only along a small segment of the cylinder.

Considering Figure 1, the electron gun' is indicated by l. The rotatingfield is created by the electrodes 2 fed two by two by two voltageslagging 90 electric degrees -from one another in the usual way. Thisrotating field is then an electric field. A magnetic field can also beadopted or even the superposition of a magnetic field upon an electricfield. The electron beam l is bent by means of two corolla shapedelectrodes and finally it is deflected by means of two deflecting ringshaped electrodes 5. The rotating and deflected electron beam. hits thefluorescent screen 6 extending along the cylindrical part of the tube.On the same figure two ring shaped electrodes 4 located near the corollashaped electrodes 3 are represented forming an 'electriccylindricallens; this feature is non-essential.

The deflecting electrodes 5 may be subdivided, according to thisinvention, in many sections, each section being isolated from oneanother and corresponding to a separate electric quantity to beexamined, as Fig. '2 shows.

According to the invention, one nlay have two separate electron beamsystems operating simultaneously in the same tube aSFigu're 3 shows.

The numerals I and H indicate the electron guns.

The numerals '2 and I2 'indi'ca'tethe "system creating the rotatingHeld; in this case the rotating field is a'magnetic onecreated bymagnetic coils, as indicated in the figure, in the usual way. Thenumerals 3 and l3indic'ate the corolla shaped bending electrodes. Thenumerals?) and T5 indicate 'the deflecting electrodes and finally calscreen. 7 d i So far a cylindrical screen covering 360 angular degreeshas been indicated but one may limit the extension of thefluorescentscreen along "a small angular segment" and the"tu'be has-'the externalaspect indicated by Figure 4. Iclaim: I V 1. An oscillographic cathoderay tube having a cylindrical fluorescent screen, the control of thenumeral 6 indicates the fluorescent cylindrith-e electron beam beingoperated by an electrostatic deflecting system of twoconcentrical'electrodes and having its time base' extended "along thefluorescent cylindrical screen by means of a rotating electric fieldcreated by a system of electrodes connected to a source of pclyphasevoltages and being symmetrically placed with respect to the axis of thetube along which an electron gun is projecting an electron beam; thesaid electron beam being bent normally to the axis of the tube by meansof corolla shaped electrodes symmetrically located with respect to theaxis of the tube; the said electron beam. being deflected by twodeflecting ring shaped electrodes, concentric and essentially parallelto one another symmetrically located with respect to the axis of thetube; the vacuum tube being itself 'cylindrically shaped and bearing thefluorescent screen along its cylindrical wall.

2. An oscillographic cathode ray tube having a cylindrical fluorescentscreen, the control of the electron beam being operated by anelectrostatic deflecting system of two concentrical electrodes andhaving its time base extended along the fluorescent cylindrical screenby means of a rotating magnetic field created by a system of coilstraversed by polyphase currents symmetrically placed with respect to theaxis of the tube along which an electron gun is projecting an electronbeam; the said electron beam being bent normally to the axis of the tubeby means of corolla shaped electrodes symmetrically located with respectto the axis of the tube; the said electron beam being deflected by twodeflecting 4 7. An oscillograph cathode ray tube according to claim 1the deflecting electrodes being subdivided in many circular sectorselectrically insulated and energized by different sources.

8. An oscillograph cathode ray tube according to claim 2 the deflectingelectrodes being subdivided in many circular sectors electrically insulated and energized by different'sources.

9. An oscillograph cathode ray tube according to claim 3 the deflectingelectrodes being subdividedin many circular sectors electricallyinsulated and energized by different sources.

10. An oscillograph cathode ray tube having two co-axial electrobeamsystems as indicated in claim 1, the corresponding two electron gunsbeing located at the top and at the bottom respeclindrical fluorescentscreen by means of a -rotating electric field superimposed upon arotating =magnetic fleld, the electric ileld .being created byelectrodes symmetrically placed-with respect to the axis of the tube andenergized by polyphase voltages and the magnetic rotating field beingcreated by coils symmetrically; placed withrespect to-theaxis of thetube and traversed by polyphase currents-symmetrically placed withrevspect to the axis of the tube along which an electron gun isprojecting an electron beam; the said electron :beam being bent normallyto the axis of 'thetube by means; of corolla shaped electrodessymmetrically located withrespect to the axis of the tube; 'thesaidelectron beam [being deflected .by two deflecting ring shapedelectrodes, con- 'centricand essentially parallel .to one anothersymmetricallylocated :with respect to the axis of the tube; -the;vacuumtube being itself cylindrically shaped and bearing the fluorescentscreen along its cylindrical wall.

4. An oscillogra-ph cathode ray tube as de-' scribed in claim land whereat the corolla outlet acylindrical electric lens is placed formed-bytwoparallel-concentric rings. v

5. An oscillograph cathode ray tube as described in claim- 2 and whereat the corolla outlet a cylindrical electric lens is placed formed bytwo parallel concentric rings; r I

6. 'An oscillograph cathode ray 1 tube as described in claim 3 and whereat the corolla outlet a cylindrical electric lens is placed formed bytwo parallel concentric rings.

tively of the'tub'e and the time axes being two parallel circles on thecylindrical screen. 4 'llh'An oscillograph. cathode ray tube having twoco-axial electron beam systems as indicated in'lclaim; 2, thecorresponding two electron guns .being'. located atQthe top andat thebottom respectively' of; thegtube and the time axes being two parallelcircles on the cylindrical screen;

12. ,An,;\oscillograph cathode ray tube having two co-axial electronbeam systems as indicated in claim :3, the corresponding twoelectronguns being; located .atthe utop and at the bottom respectively of thetube and the time axes being two parallel'circles onthecylindricaly'screen;

' 13. An oscillograph cathode ray tube having an electron beamxsystem asdescribed in claim 1 and having its-fluorescent, cylindrical screen'ex-.7 tending only along a segment. of the cylinder.

:14. :An oscillograph cathode ray tubehaving an electron beam system as,described in claim 2 and having its cylindrical-fluorescent screenextending only along ,a segment of the cylinder.

15.- An oscillograph cathode ray tuberhaving an electron beam system asdescribed inclaim -3 and having its cylindrical fluorescent screenextending only along a segment of the cylinden;

Number ANDREA PINCIROLI:

. @REFERENCESCITED The following reie'r ences'are of record in the file"ofthis patent: r s

. :UNITEDTSTA'IEHS PArENTsT Name- Date 1,962,873

Parker June12, 1934 I

